Noise in Dash Related To Temperature Control – Troubleshooting

It’s very uncommon for drivers to experience Noise in Dash Related to Temperature Control, which may be both annoying and perplexing. While turning the thermostat up or down, or turning on the air conditioner or heater, you may hear a rattling or buzzing sound. Indicators of a problem with the HVAC system include these symptoms. To avoid further harm and ensure the system continues to function properly, it is crucial to quickly identify the issue and implement a solution.

Symptoms of Noise in Dash related to Temperature Control

A rattling or buzzing sound when altering the temperature or turning on the air conditioner or heater is the most common symptom of noise in dash related to climate control. The vents, the front of the car, or the dashboard itself could all be sources of this commotion. Other signs could be:

  • Problems with temperature regulation
  • less air coming out of the vents
  • Smells from the ducts that don’t seem to belong
  • An HVAC system that isn’t working properly

Pay close attention to the source of the sound to see if the dashboard is the likely culprit. The HVAC system, particularly a blend door or actuator, is probably to blame if the noise is coming from the dashboard. The car’s fan or air filter may be at fault if the noise is not emanating from that area.

It is crucial to properly identify the problem before attempting to remedy it, as the noise could be the result of something else, such as loose pieces or a broken exhaust system. Talking to a professional mechanic or technician about the problem and getting their advice on what to do about it is your best bet.       

Note: There is a vice versa, which is hearing a clicking sound from a car A/C when you switch the engine on, therefore what to do in that situation will be dealt with separately, because that issue originated from other causes and reasons.

Why Do You Hear the Noise in Dash related to Temperature Control When Car Is Off?

(Car Engine off is not necessary)


A Bad Actuator of the Blend Door

Noise in Dash Related To Temperature Control

I’m curious about the actuator for the blend door. The heating, ventilation, and air conditioning HVAC system in the car must be operated by hand. Common blenders and actuators work in opposite directions, defrosting in one and cooling in the other. A blend door actuator, also known as a climate control motor, is a small electric motor whose primary job is to regulate the temperature inside of a vehicle.

A defective blend actuator might cause a clicking sound to continue playing in the car’s dashboard after the engine has been shut off. The volume and pitch of this sound fluctuate depending on how often it occurs. The portion of the dashboard containing the climate controls clicks continuously. Changing the temperature or turning on the air conditioning in the automobile can also make things noisier.

If your actuator is malfunctioning, the door won’t turn automatically. There will be a clicking or knocking noise coming from the dashboard at that moment. Plastic gears form the basis of the transmission’s internal construction. That’s why there’s a clicking sound as the plastic gears mesh and mesh again.

The HVAC Controller Lost Its Settings

Temperature, humidity, and air quality can all be managed with the help of an HVAC (heating, ventilation, and air conditioning) system installed in your motor vehicle. The heating, ventilation, and air conditioning system (HVAC) is responsible for maintaining a comfortable interior environment.

The unbalanced temperature and humidity levels are to blame for any strange sounds coming from the dashboard. A mechanical component that is either loose or broken might cause the HVAC system to malfunction, as well as the dashboard to make loud noises.

An HVAC unit is an intricate machine. Assist from actuators, sensors, and motors will allow HVAC to guide airflow precisely where it needs to go. False data from the sensors will prevent this system from taking the appropriate action. Misjudging where the hot engine is located when the car is in motion can result in a rattling sound coming from the dashboard.

Relay Failure

Noise in Dash Related To Temperature Control

Although the specific location of relays varies from vehicle to vehicle, most fuse boxes may be found beneath the hood. Understand the function of your car’s relays. Relay switches are mostly used to regulate electrical current in a system.

Without a relay, switches can easily become damaged or even ignite. In the event that the relay is functional, all of your vehicle’s electrical features, including the A/C, headlights, taillights, etc., will operate as intended.

When the magnet in the power supply moves from the mains to the motor, it causes the dashboard to emit a humming noise. Moreover, dirt on the junctions can result in clicking sounds from the dashboard, especially if it is frequently joining and disconnecting at fast speed when plugging into the mains.

To Diagnose:

Use your ears to locate the offending relay, place your hand on the relay and feel it click. Remove the relay and replace it with one of its neighbors; many relays in the same fuse box are identical. A quick and easy technique to troubleshoot is by swapping out the relay. A rattling noise is frequently heard when a defective relay is shaken.

How to Test Relay

Use a voltmeter and a hot wire to test the relay’s resistance, or try out this convenient plug-and-play device.

Stepper Motor

In modern cars, a defective stepper motor is a typical issue. This component is in charge of regulating the idle speed. Your car’s stepper motor will continuously adjust the air flow to the engine based on the new parameter. The control panel may make loud noises if it is damaged. When your cars stop working, it’s usually because of a faulty stepper motor. When this happens, fixing the engine right away is crucial.

Air Filter Issue

(Connected to this issue but very rare against this issue)

Having a dirty air filter is another common culprit. If the air filter gets clogged, the fan has to work harder and noisier to push the same amount of air through. The system’s efficiency may drop as a result of overheating.

Moreover, environmental conditions like temperature and humidity might exacerbate the issue. The plastic parts of the HVAC system can become brittle and shatter in very cold or very hot environments, causing annoying noise. Condensation from the outside air can build up inside the system, causing rust and corrosion, which in turn can produce noise if not addressed.

Age and Wear And Tear

Temperature-control related dashboard noise can also be caused by age and general wear and tear. A poorly maintained HVAC system will eventually have noisy components due to age-related wear and tear.

How to Fix Noise in Dash Related To Temperature Control

Blend Door Actuator Testing/Replacement

Symptoms like a clicking sounds under the driver’s side dash or a knocking sound from the dashboard indicate a need to reset the blend actuator, which can only be done at a service center. Those with technical training can verify this component on their own. The first step is to turn off your car’s negative battery terminal. If your vehicle has a radio code, be sure to write it down or, even better, learn how to calibrate it. If you do not have a calibrator, you will need to take your car to a mechanic.

Steps to replace a blend door actuator:

  1. Take your car’s negative battery cable off.
  2. Take the glove box off, and then pull it out from the knobs that hold it in place. After that, take everything out of the glove box and put it somewhere else.
  3. Disconnect the wire harness. Find where the heater core is, which is behind where the glove box used to be.
  4. To get rid of the air filter assembly, pull out the two screws that hold it in place.
  5. Remove the door actuator and actuator with a small screwdriver.
  6. Before you put in a new one, you should manually turn the blend door in both directions to make sure it doesn’t get stuck and break the new actuator.
  7. Put in the new actuator for the blend door.

Replace Out Faulty Relays

There is a good chance that the clicking sounds coming from your car’s engine compartment is due to a faulty relay. You can’t fix this problem in any way other than by buying a new one. You can tell if the relays in your car are working properly by using a multimeter to test them. First, make sure that there are 12 volts in the 85 places in the fuse box where the relay is plugged in using a multimeter to measure the DC voltage and the switch in the cabin. Otherwise, make sure the right fuse isn’t blown. Be certain the switch is allowing power to reach the relay if the fuse is still good.


  1. Find where the relays are in your car. Depending on the make and model of your car and the systems that the relays manage, they may be located either under the hood or in the dashboard. If you are unsure of its precise location, please refer to the user handbook.
  2. If you can still reach it, remove the old relay by hand or using simple tools.
  3. Getting a new one. Now, you’ll want to double-check with the auto shop that the replacement relay is a direct replacement for the one it’s replacing. Following that, simply place it where it belongs by aligning it and pressing it into position with your finger.

The Heater Motor Has To Be Calibrated

Recalibrate the air-conditioning controller or heating and ventilation system to get rid of the clicking sound coming from the dashboard. Follow the steps below:


  1. Select automatic mode.
  2. Disengage the Auto mode when it is displayed.
  3. We’ll go to the electrical panel’s fuse box and pull the fuse for the air conditioning control system for a minute or two to reset the device.

How to Perform Regular HVAC Maintenance      

To stop future dashboard noise problems caused by the thermostat. Maintaining and servicing the heating, ventilation, and air conditioning system on a regular basis is essential. This includes:

  • Checking and replacing the air filter on a regular basis
  • Inspect and repairing damaged or worn hoses
  • Inspect and replacing worn or damaged belts
  • Lubricating moving parts as directed by the manufacturer
  • Examining the system on a regular basis
  • Maintaining a suitable charge of refrigerant in the air conditioning system

If the HVAC system is serviced and maintained frequently. Vehicle owners can assist guarantee optimal performance and head off any temperature-related dashboard-noise problems by checking the system regularly.

About The Author

Avatar for Ibrar Ayyub

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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